Table 9.

Comparison of vegetation multimetric index (VMMI) means between the least and most disturbed sites for calibration and validation data sets using two-sample t tests

	Least disturbed	Most disturbed
Dataset	Mean ± SE	Mean ± SE	t statistic	df	p value
Calibration	67.32 ± 0.77	45.72 ± 1.18	15.33	443.79	<0.0001
Validation	65.76 ± 1.99	47.03 ± 2.44	5.94	117.52	<0.0001

See Table 2 for sample sizes of the least and most disturbed sites

SE standard error, df degrees of freedom based on Welch approximation because variances between the least and most disturbed sites are unequal